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Catalogue substitution sheet
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NTN W 638/9-2Z

Deep groove ball · 2Z shield

The seat — 9 MM × 17 MM × 6 MM

Bore
9 MM
Outside dia
17 MM
Width
6 MM
Type
Deep groove ball
Seal
2Z shield
Clearance
CN (Normal)
Precision
ABEC-1 (P0)
Dynamic C
0.8 kN
Static C0
0.3 kN

No other designation in the catalogue shares this bore × outside diameter × width. There is nothing to compare, and nothing here guesses at a near neighbour: a bearing one millimetre off this seat is a different seat.

What this sheet is — and what the catalogue did not say

Anyone with this link can view this part and its recorded candidate comparison.

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